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Propeller shaft rotation drag?

Anything related to the operation of your boat. Steering, Bilge Pumps, thru-hulls, bottom paint, etc.

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Re: Propeller shaft rotation drag?

Postby SanJuanDreamer » February 7th, 2018, 1:46 pm

For what its worth...I have 98 Mariner with 1500hrs.
While mine is on the hard...for weeks sometimes, I can place a towel on a blade and turn it by hand, the cutlass bearing will squeal, its not free spinning but seems easy enough. Both shafts take the same amount of pressure to turn and I have dripless.

Seems to me, if the shaft is disconnected from the drive, it should spin easily, if not, then maybe look at the cutlass bearing and shaft tube.
Just my two cents...I may deserve change... :down:

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Re: Propeller shaft rotation drag?

Postby Viper » February 7th, 2018, 7:03 pm

You should be able to turn the shafts by hand. A little bit of resistance is not uncommon but you should not have to heave on it especially when uncoupled from the tranny flange. Check the condition of the strut bearings and whether the shafts are centered in them and not pinching one side. Also ensure the shafts are centered in the tube on the outside of the hull where they enter. A melted seal in a dripless log or a warped log housing will cause the shaft to bind but I would also expect to see a leak at the log under these conditions. Depending on the condition and location, a bent shaft can also cause your symptom.

amanphoto wrote:Source of the post..... I checked the alignment and it is with in tolerances.....

How did you do this and what tolerance are you using?
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Re: Propeller shaft rotation drag?

Postby Nharrison5 » February 17th, 2018, 10:39 pm

amanphoto wrote:Source of the post This is the lip seal? I have not messed with this at all. Now that the boat is out of the water, I can look at it. Little bit of water that collects in the bilge under the seal. The seals do not leak.

I don’t think that is the issue. It is a Tides Marine shaft seal. Forward, it has a bearing that the shaft spins through. There is water in the rubber baffle. It could be something caught between the shaft and the seal , but if that is the case it would probably leak. Sometimes trash gets caught up in the baffle and that could be the source of something caught between the shaft and where it leave s the boat. You may be able to burp any remaining water out by compressing the rubber baffle. Since it is out of the water, it is fairly simple to disconnect and check out.

I would strongly urge you to read the literature on it first though. If you make a mistake with it you can create a leak. It is important to order new set screws and not reuse the old. You may want to consider replacing if the unit is over six years old.

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